JSON file format
Checks that the web manifest file has contents formatted as JSON.
A web manifest file is a JSON file that can be used by web browser to discover certain information about the website. It is useful for making Progressive Web Apps that can be installed on the homepage of a user's mobile device, as well as for other purposes. A proper web manifest file allows users to create shortcuts to the website which have an optimized name and icon.
This test downloads the manifest file and make sure that it is valid a JSON text file.
For more information, please read the documentation on MDN Web Docs.
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